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    I'm conducting my doctoral thesis which requires measuring the 3-D ground reaction force (GRF) (vertical-antro posterior and mediolateral forces) in children.
    -I take the GRF for the children (8-11 years) with different bag style (ordinary backpack and new style ergononmic bag).

    -The child walk on a 5-meter walkway with the forceplate(AMTI) at the midway(i have only one force plate).

    - Firstly, the child walk without bag as a refernce value.

    - Then, the child carry one of the 2 bags (random choice),each bag has 15%of the body weight, and walk along the walkway at a self selected velocity, repeating this step till making right foot landing mid-plate (3-5 trials).

    - The previous step repeated with the other bag.

    - The previous steps conducted to measure the GRF for the right side.

    - For measuring GRF for the left side we conduct the same steps but by asking the child to walk and make the foot landing by the left side

    My sample is 30 subject, after i started application on 7 children, i found that some measures of the GRF are more in unloaded conditions, in comparison to loaded conditions. I don't know is it logic? Can the acceleration be the cause in that? is there any point i must pay attention for in the following cases.
    Thanks in advance for you insights.
    Dalia Mosaad, PT, PhD studentAssisstant lecturer Faculty of physical therapyCairo University
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